Mini Siren Comes with 50mm Speaker. Power 9-12V.
Capable of easy adjustments for experimenting with Resistor values which affect oscillator frequency.
Experiment with the speaker to learn about wave reflections and how they affect volume.
Add to a burglar alarm or use them with your hobby railway village set. More noise for your dollar.
Extensive Construction Notes with step-by-step photos aimed at allowing students to work at their own pace, and achieve a high success rate.